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Delta IV

This article is about the rocket. For other uses, see Delta 4 (disambiguation).

Delta IV
Delta IV Medium launch carrying DSCS III-B6.
FunctionOrbital launch vehicle
ManufacturerUnited Launch Alliance
Country of originUnited States
Cost per launchUS$164+ million[1]
Size
Height63.0–70.7 m (206.7–232.0 ft)
Diameter5.1 m (17 ft)
Mass249,500–733,400 kg (550,100–1,616,900 lb)
Stages2
Capacity
Payload to LEO
Mass11,470–28,790 kg (25,290–63,470 lb)[2]
Payload to GTO
Mass4,440–14,220 kg (9,790–31,350 lb)
Associated rockets
FamilyDelta (rocket family)
Comparable
Launch history
StatusRetired
Launch sites
Total launches
  •     Medium: 3
  •     M+ (4,2): 15
  •     M+ (5,2): 3
  •     M+ (5,4): 8
  •     Heavy: 16
Success(es)
44
  •     Medium: 3
  •     M+ (4,2): 15
  •     M+ (5,2): 3
  •     M+ (5,4): 8
  •     Heavy: 15
Partial failure(s)1 (Heavy Demo)
First flight
Last flight
Type of passengers/cargo
Boosters (Medium+) – GEM 60
No. boosters2[a] or 4[b]
Gross mass33,638 kg (74,158 lb)
Maximum thrust826.6 kN (185,800 lbf)
Specific impulseSL: 245 s (2.40 km/s)
Burn time91 seconds
PropellantAP / HTPB / Al
Boosters (Heavy) – CBC
No. boosters2
Gross mass226,400 kg (499,100 lb)
Powered by1 × RS-68A
Maximum thrust3,140 kN (705,000 lbf) (sea level)
Specific impulseSL: 360 s (3.5 km/s)
vac: 412 s (4.04 km/s)
Burn time242 seconds[2]
PropellantLH2 / LOX
First stage – CBC
Gross mass226,400 kg (499,100 lb)
Powered by1 × RS-68A
Maximum thrust3,140 kN (705,000 lbf) (sea level)
Specific impulseSL: 360 s (3.5 km/s)
vac: 412 s (4.04 km/s)
Burn time245 seconds (328 seconds in Heavy configuration)[2]
PropellantLH2 / LOX
Second stage – DCSS
Gross mass4-m: 24,170 kg (53,290 lb)
5-m: 30,700 kg (67,700 lb)
Powered by1 × RL10-B-2
Maximum thrust110 kN (25,000 lbf)
Specific impulse462 s (4.53 km/s)
Burn time850–1,125 seconds
PropellantLH2 / LOX
[edit on Wikidata]

Delta IV was a group of five expendable launch systems in the Delta rocket family. It flew 45 missions from 2002 to 2024. Originally designed by Boeing's Defense, Space and Security division for the Evolved Expendable Launch Vehicle (EELV) program, the Delta IV became a United Launch Alliance (ULA) product in 2006. The Delta IV was primarily a launch vehicle for United States Air Force (USAF) military payloads, but was also used to launch a number of United States government non-military payloads and a single commercial satellite.

The Delta IV had two main versions which allowed the family to cover a range of payload sizes and masses: the Medium (which had four configurations) and Heavy. The final flight of Medium occurred in 2019. The final flight of Heavy was in April 2024.

Delta IV vehicles were built in the ULA facility in Decatur, Alabama.[5] Final assembly was completed at the launch site by ULA: at the horizontal integration facility for launches from SLC-37B pad at Cape Canaveral and in a similar facility for launches from SLC-6 pad at Vandenberg Space Force Base.

  1. ^ "Surplus Missile Motors: Sale Price Drives Potential Effects on DOD and Commercial Launch Providers".
  2. ^ a b c Cite error: The named reference :1 was invoked but never defined (see the help page).
  3. ^ Kyle, Ed. "Delta IV Launch Record". Space Launch Report. Archived from the original on 25 April 2022. Retrieved 21 January 2023.{{cite web}}: CS1 maint: unfit URL (link)
  4. ^ Graham, William (24 September 2022). "Last West Coast Delta IV Heavy launches with NROL-91". NASASpaceFlight. Retrieved 25 September 2022.
  5. ^ "Boeing and Lockheed Martin Complete United Launch Alliance Transaction" (Press release). Boeing. 1 December 2006. Archived from the original on 2 May 2013.


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